All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 71-97, 26-99, and 49-99.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Hydrochloric Acid

Conc.

Wt.%

50°F

75°F

100°F

125°F

150°F

175°F

200°F

225°F

Boiling

10°C

24°C

38°C

52°C

66°C

79°C

93°C

107°C

1

-

-

0.07

0.11

0.18

-

0.21

-

0.01

1.5

-

-

-

-

-

-

-

-

-

2

-

-

0.10

0.16

0.21

-

0.26

-

0.04

2.5

-

-

-

-

-

-

-

-

-

3

-

-

-

-

-

-

-

-

-

3.5

-

-

-

-

-

-

-

-

-

4

-

-

-

-

-

-

-

-

-

4.5

-

-

-

-

-

-

-

-

-

5

-

-

0.11

0.19

0.25

-

0.30

-

0.08

7.5

-

-

-

-

-

-

-

-

-

10

-

-

0.13

0.20

0.24

-

0.29

-

0.13

15

-

-

0.10

0.18

0.23

-

0.28

-

0.21

20

-

-

0.10

0.15

0.21

-

0.30

-

0.29

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 37-92, 30-94, and 42-95.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Phosphoric Acid

Conc.

Wt.%

125°F

150°F

175°F

200°F

225°F

250°F

275°F

300°F

Boiling

52°C

66°C

79°C

93°C

107°C

121°C

135°C

149°C

10

-

-

-

-

-

-

-

-

0.07

30

-

-

-

-

-

-

-

-

0.07

50

-

-

-

0.03

-

-

-

-

0.09

60

-

-

-

0.03

-

-

-

-

0.14

65

-

-

-

-

-

-

-

-

-

70

-

-

-

0.02

-

0.08

-

-

0.21

75

-

-

-

-

-

-

0.04

-

-

80

-

-

-

0.02

-

0.09

0.05

-

0.04

85

-

-

-

0.02

-

0.07

0.04

0.08

0.10

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 113-92, 31-94, and 47-97.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Sulfuric Acid

Conc.

Wt.%

75°F

100°F

125°F

150°F

175°F

200°F

225°F

250°F

275°F

300°F

350°F

Boiling

24°C

38°C

52°C

66°C

79°C

93°C

107°C

121°C

135°C

149°C

177°C

1

-

-

-

-

-

-

-

-

-

-

-

-

2

-

0.07

0.09

0.13

0.11

0.10

-

-

-

-

-

0.01

3

-

-

-

-

-

-

-

-

-

-

-

-

4

-

-

-

-

-

-

-

-

-

-

-

-

5

-

0.07

0.08

0.15

0.13

0.11

-

-

-

-

-

0.01

10

-

0.04

0.08

0.11

0.11

0.11

-

-

-

-

-

0.01

20

-

0.03

-

0.08

-

0.11

-

-

-

-

-

0.02

30

-

0.02

-

0.06

-

0.09

-

-

-

-

-

0.02

40

-

-

-

0.03

-

0.06

-

-

-

-

-

0.02

50

-

-

-

0.03

-

0.04

-

-

-

-

-

0.03

60

-

-

-

0.02

-

0.03

-

-

-

-

-

0.05

70

-

-

-

-

-

0.01

-

0.03

-

0.11

-

0.15

80

-

-

-

-

-

0.01

-

0.03

-

0.08

0.44

4.76

90

-

-

-

-

-

0.02

-

0.05

0.11

0.14

0.76

-

96

-

-

-

-

-

0.02

-

0.09

0.22

0.35

2.59

-

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 37-92, 29-94, 47-94, 42-95, and 14-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.